摘要
南石壁高速公路隧道在雨季出现渗水现象,严重影响公路的畅通,存在安全隐患。为查明其渗水路径和水源,采用不同高密度电法测量装置进行实地测量,运用三维电阻率成像技术,结合当地地质条件和现场调查资料,分析隧道围岩的渗水情况,结果表明:高密度电法野外工作采用不同的测量装置,利用各自跑极方式的不同,在成果解释中能达到相互补充的效果;南石壁隧道围岩中内部岩溶裂隙强烈发育;岩溶水主要来自梅岭水库渗漏和雨水补给,并探明了几条主要的渗水路径。该案例说明高密度电法三维电成像技术揭示的地下地质结构,对岩溶灾害的探测、处治具有十分重要的意义。
During the rainfall season the leakage of water in Nanshibi highway tunnel seriously influences the traffic of the tunnel, resulting in security risk. In order to find out the paths of leakage and sources of the water, this work used different devices of the high-resolution electrical resistivity to carry out in-situ meas- urements. Combining this survey with local geological conditions and other survey data available, the leakage situation of the tunnel was analyzed in detail. The results show that the high-density electrical method can work well by using different measurement devices and different running ways. In the Nanshibi tunnel, there are numerous karst cracks. The karst water mainly comes from the leakage of Meiling reservoir and supple- ment of rainfalls. Several major paths of the leakage have been clarified by the survey. This case study shows that the 3D imaging of electrical resistivity of the high-resolution electrical method can reveal underground geological structure, which is of significance for detection and treatment of karst hazards.
出处
《中国岩溶》
CAS
CSCD
北大核心
2016年第3期291-298,共8页
Carsologica Sinica
基金
国家自然科学基金(51279219)
关键词
高密度电法
岩溶
二维电成像
三维电成像
南石壁隧道
high-resolution electrical method, karst, 2D electrical resistivity tomography, 3D electrical re- sistivity tomography, Nanshibi highway tunnel
